Search found 9 matches


can't one just calculate p(BBB) = P(B1*P(B2)*P(B3) = 1/2 * 1/2 * 1/2 = 1/8

p(GGG) = P(G1)*P(G2)*P(G3) = 1/2 * 1/2 * 1/2 = 1/8

p(BBB)+ p(GGG)= 1/8 + 1/8 = 1/4

anything wrong with this straightforward approach?

by oldguy

Mon Apr 04, 2011 6:47 am
Forum: Problem Solving
Topic: Probability
Replies: 35
Views: 21009

e. it is the only answer that weakens the statement.

by oldguy

Tue Mar 22, 2011 6:57 am
Forum: Critical Reasoning
Topic: undermines the conclusion
Replies: 110
Views: 40731

i eliminated a,d,e and then guessed c instead of b. is c correct?
this is one of those questions to think about for one minute and then answer and move on!

by oldguy

Mon Mar 21, 2011 8:46 am
Forum: Critical Reasoning
Topic: Oak trees
Replies: 88
Views: 36498
by oldguy

Sun Mar 20, 2011 5:07 pm
Forum: Sentence Correction
Topic: Speed limit - long one!
Replies: 282
Views: 97715

so why can the answer not be that 1,000 red chips were picked and one purple? 1,000 * 11 = 11,000 8 * 1 = 8 11,000 * 8 = 88,000. then the answer would be a. (1 purple chip. ) the question does not limit the number of chips drawn. or pick two purple chips 8*8 = 64. 125 red chips is 11*125= 1,375. 64*...

by oldguy

Sun Mar 20, 2011 9:14 am
Forum: Problem Solving
Topic: More Primes
Replies: 93
Views: 40844

A.

the article mentions b,c,d,e. so A. long passage. more questions on it ? (now that we have all read it). thanks.

by oldguy

Fri Mar 18, 2011 7:10 am
Forum: Reading Comprehension
Topic: Apes are our friends
Replies: 69
Views: 37743

d. we know it is 12/h. where h < 15 and 18. so answers a,b,e are out. leaves c and d . c < 1 so not likely. answer is then d. or do the math. which i see on the other answers. my answer is done in 15 seconds. the math takes just 45 seconds or so. one should do the math to be sure on a question like ...

by oldguy

Thu Mar 17, 2011 12:41 pm
Forum: Problem Solving
Topic: og math # 130
Replies: 132
Views: 51338

D. foods "make" and reason is "that".

not a,b -- "makes", not c,e "because"

by oldguy

Thu Mar 17, 2011 12:02 pm
Forum: Sentence Correction
Topic: Spicy
Replies: 151
Views: 63542
by oldguy

Wed Mar 16, 2011 11:48 am
Forum: Sentence Correction
Topic: Speed limit - long one!
Replies: 282
Views: 97715